Name: a practical and novel method to extract genomic dna from blood collection kits for plasma protein preservation
Uploaded: 2013-05-18T14:00:00
Description: Watch this Scientific Journal Video about A Practical and Novel Method to Extract Genomic DNA from Blood Collection Kits for Plasma Protein Preservation at JoVE.com

1. Sample Collection
<ol>
 <li>Collect blood samples from individuals with proper informed consent. For each individual, draw 4 to 5 ml of blood into a P100 tube (BD Diagnostics, Franklin Lake, NY, USA). For comparison purposes, simultaneously collect blood in an EDTA tube.</li>
 <li>The BD P100 tubes contain 15.8 ml spray-dried K2EDTA and a lyophilized proprietary broad spectrum cocktail of protease inhibitors to prevent coagulation and stabilize the plasma proteins. They also contain a mechanical separator....

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Many human diseases have genetic causes and exploring the genetic basis of human disease demands an increasing high quality DNA. The most common source of DNA used in genetic studies is anticoagulated whole blood. Because most clinical laboratories perform biochemical, serologic, and viral testing as a first step in phenotypic outcome investigation, the blood is often collected in a plasma tube. After collection of the plasma, the compacted blood is often discarded. Therefore, when DNA is needed to conduct gen...

<table border="1">
 <tbody>
 <tr>
 <td>Name of the reagent/equipment</td>
 <td>Company</td>
 <td>Catalogue number</td>
 </tr>
 <tr>
 <td>BD P100 tubes</td>
 <td>BD Diagnostics</td>
 <td>366448</td>
 </tr>
 <tr>
 <td>EDTA tubes</td>
 <td>BD Diagnostics</td>
 <td>367863</td>
 </tr>
 <tr>
 <td>Sucrose</td>
 <td>Sigma</td>
 <td>S9378</td>
 </tr>
 <tr>
 <td>Paper clip</td>
 <td>Office product</td>
 <td></td>
 </tr>
 <tr>
 <td>15 ml tube</td>
 <td>Corning</td>
 <td>430052</td>
 </tr>
 <tr>
 <td>Red blood cells (RBC)</td>
 <td>Qiagen</td>
 <td>158389 (kit)</td>
 </tr>
 <tr>
 <td>Phosphate Buffer Saline (PBS)</td>
 <td>Thermo Scientific</td>
 <td>SH30256.01</td>
 </tr>
 <tr>
 <td>BioSprint 96 DNA Blood Kit (48) </td>
 <td>Qiagen</td>
 <td>940054</td>
 </tr>
 <tr>
 <td>1.7 ml microtubes</td>
 <td>Axygen</td>
 <td>MCT-175-C</td>
 </tr>
 <tr>
 <td>Human Immuno DNA Analysis BeadChip Kit</td>
 <td>Illumina</td>
 <td>WG-352-1001</td>
 </tr>
 <tr>
 <td>Bead array reader</td>
 <td>Illumina</td>
 <td>NA</td>
 </tr>
 <tr>
 <td>GenomeStudio Software</td>
 <td>Illumina</td>
 <td>N/A</td>
 </tr>
 </tbody>
</table>

a practical and novel method to extract genomic dna from blood collection kits for plasma protein preservation

Laboratory tests can be done on the cellular or fluid portions of the blood. The use of different blood collection tubes determines the portion of the blood that can be analyzed (whole blood, plasma or serum). Laboratories involved in studying the genetic basis of human disorders rely on anticoagulated whole blood collected in EDTA-containing vacutainer as the source of DNA for genetic / genomic analysis. Because most clinical laboratories perform biochemical, serologic and viral testing as a first step in phenotypic outcome investigation, anticoagulated blood is also collected in heparin-containing tube (plasma tube). Therefore when DNA and plasma are needed for simultaneous and parallel analyses of both genomic and proteomic data, it is customary to collect blood in both EDTA and heparin tubes. If blood could be collected in a single tube and serve as a source for both plasma and DNA, that method would be considered an advancement to existing methods. The use of the compacted blood after plasma extraction represents an alternative source for genomic DNA, thus minimizing the amount of blood samples processed and reducing the number of samples required from each patient. This would ultimately save time and resources.
The BD P100 blood collection system for plasma protein preservation were created as an improved method over previous plasma or serum collection tubes1, to stabilize the protein content of blood, enabling better protein biomarker discovery and proteomics experimentation from human blood. The BD P100 tubes contain 15.8 ml of spray-dried K2EDTA and a lyophilized proprietary broad spectrum cocktail of protease inhibitors to prevent coagulation and stabilize the plasma proteins. They also include a mechanical separator, which provides a physical barrier between plasma and cell pellets after centrifugation. Few methods have been devised to extract DNA from clotted blood samples collected in old plasma tubes2-4. Challenges from these methods were mainly associated with the type of separator inside the tubes (gel separator) and included difficulty in recovering the clotted blood, the inconvenience of fragmenting or dispersing the clot, and obstruction of the clot extraction by the separation gel.
We present the first method that extracts and purifies genomic DNA from blood drawn in the new BD P100 tubes. We compare the quality of the DNA sample from P100 tubes to that from EDTA tubes. Our approach is simple and efficient. It involves four major steps as follows: 1) the use of a plasma BD P100 (BD Diagnostics, Sparks, MD, USA) tube with mechanical separator for blood collection, 2) the removal of the mechanical separator using a combination of sucrose and a sterile paperclip metallic hook, 3) the separation of the buffy coat layer containing the white cells and 4) the isolation of the genomic DNA from the buffy coat using a regular commercial DNA extraction kit or a similar standard protocol.

DNA quality assessment and concentration measurement
The yields of P100_DNAs were significantly lower than those of EDTA_DNAs (Tables 1 and 2). The DNA purity represented by its 260/280 ratio value is similar for both P100_DNA and EDTA_DNA sample set (Tables 1 and 2). The quality of the DNA is fairly uniform within each set of sample although some degradation is seen in the EDTA_DNA samples, as indicated by light smear (<str...

Watch this Scientific Journal Video about A Practical and Novel Method to Extract Genomic DNA from Blood Collection Kits for Plasma Protein Preservation at JoVE.com

A Practical and Novel Method to Extract Genomic DNA from Blood Collection Kits for Plasma Protein Preservation

We are describing a new method of isolating genomic DNA from whole blood collected for plasma/serology. After plasma collection, the compacted blood is usually discarded. Our novel method represents a significant improvement over existing methods and makes DNA and plasma available from a single collection, without requesting additional blood.

Laboratory tests can be done on the cellular or  fluid portions of the blood. The use of different blood collection tubes  determines the portion of the ...

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